There are a few possible causes of a black computer screen. Depending on your hardware, the cause could be related to your graphics card, power supply, or other components.
1. Graphics Card Issues: It’s possible that the graphics card is not properly seated in the motherboard or has gone bad. If your desktop computer’s power supply is working but you have no video output from the graphics card, try reseating the graphics card and powering up again. If that doesn’t work, check the connections between the graphics card and monitor. Make sure everything is plugged in and tightened properly.
If reseating the graphics card and checking the connections does not resolve the issue, it may be time to replace the graphics card. Some signs that the graphics card has gone bad are slow or choppy performance or artifacts (strange shapes) appearing on the screen.
2. Power Supply Issues: If your PC appears dead, one possibility is that your power supply has gone bad. If it’s been a while since you last replaced your power supply, it might be time to buy a new one. To test if this is the issue, try unplugging the power cord from the back of your computer, waiting a few minutes, and then plugging it back in. If the fans in your computer start spinning, it could be a sign that your power supply is working.
3. Overheating: Another potential cause of a black screen is an overheating issue. If your computer is running too hot, it can shut down in order to protect itself from damage. If this is the case, check to make sure the vents on your computer are clear and free of dust. If they are, try replacing the thermal paste on the CPU and GPU, which helps improve cooling and can prevent overheating.
4. Monitor Problems: Sometimes the cause of a black screen is not related to the computer itself, but rather the monitor. Check your monitor to make sure it’s plugged in and turned on properly. If so, try replacing the cable that connects the monitor to the computer. If that doesn’t work, the problem is more likely with the monitor than the graphics card.
In conclusion, a black computer screen can be caused by several different issues. If your desktop computer’s power supply is working but there’s no video output from the graphics card, try reseating the graphics card and checking the connections between the graphics card and monitor. If that doesn’t work, it may be necessary to replace the graphics card. Other potential causes include power supply problems, overheating, and monitor issues.